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qpbo_extra.cpp
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qpbo_extra.cpp
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/* QPBO_extra.cpp */
/*
Copyright 2006-2008 Vladimir Kolmogorov (vnk@ist.ac.at).
This file is part of QPBO.
QPBO is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
QPBO is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with QPBO. If not, see <http://www.gnu.org/licenses/>.
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "qpbo.h"
using namespace qpbo;
/////////////////////////////////////////////////////////////////////////
/////////////////////////////////////////////////////////////////////////
/////////////////////////////////////////////////////////////////////////
template <typename REAL>
void QPBO<REAL>::ComputeRandomPermutation(int N, int* permutation)
{
int i, j, k;
for (i=0; i<N; i++)
{
permutation[i] = i;
}
for (i=0; i<N-1; i++)
{
j = i + (int)((rand()/(1.0+(double)RAND_MAX))*(N-i));
if (j>N-1) j = N-1;
k = permutation[j]; permutation[j] = permutation[i]; permutation[i] = k;
}
}
template <typename REAL>
void QPBO<REAL>::MergeMappings(int nodeNum0, int* mapping0, int* mapping1)
{
int i;
for (i=0; i<nodeNum0; i++)
{
int j = mapping0[i] / 2;
int k = mapping1[j] / 2;
mapping0[i] = 2*k + ((mapping0[i] + mapping1[j]) % 2);
}
}
/////////////////////////////////////////////////////////////////////////
/////////////////////////////////////////////////////////////////////////
/////////////////////////////////////////////////////////////////////////
#define SET_SISTERS(a, a_rev) (a)->sister = (a_rev); (a_rev)->sister = (a);
#define SET_FROM(a, i) (a)->next = (i)->first; (i)->first = (a);
#define REMOVE_FROM(a, i) if ((i)->first==(a)) (i)->first=(a)->next;\
else { Arc* a_TMP_REMOVE_FROM; for (a_TMP_REMOVE_FROM=i->first; ; a_TMP_REMOVE_FROM=a_TMP_REMOVE_FROM->next)\
if (a_TMP_REMOVE_FROM->next==(a)) { a_TMP_REMOVE_FROM->next=(a)->next; break; } }
#define SET_TO(a, j) (a)->head = (j);
template <typename REAL>
inline void QPBO<REAL>::FixNode(Node* i, int x)
{
Node* _i[2] = { i, GetMate0(i) };
Arc* a;
Arc* a_next;
for (a=_i[x]->first; a; a=a->next)
{
mark_node(a->head);
a->head->tr_cap += a->r_cap;
REMOVE_FROM(a->sister, a->head);
a->sister->sister = NULL;
a->sister = NULL;
}
for (a=_i[1-x]->first; a; a=a_next)
{
mark_node(a->head);
a->head->tr_cap -= a->sister->r_cap;
REMOVE_FROM(a->sister, a->head);
a->sister->sister = NULL;
a->sister = NULL;
a_next = a->next;
a->next = first_free;
first_free = a;
}
_i[0]->first = _i[1]->first = NULL;
}
template <typename REAL>
inline void QPBO<REAL>::ContractNodes(Node* i, Node* j, int swap)
{
code_assert(IsNode0(i) && IsNode0(j) && swap>=0 && swap<=1);
Node* _i[2] = { i, GetMate0(i) };
Node* _j[2];
Arc* a;
Arc* a_selfloop = NULL;
int x;
if (swap == 0) { _j[0] = j; _j[1] = GetMate0(j); }
else { _j[1] = j; _j[0] = GetMate0(j); }
_i[0]->tr_cap += _j[0]->tr_cap;
_i[1]->tr_cap += _j[1]->tr_cap;
for (x=0; x<2; x++)
{
Arc* a_next;
for (a=_j[x]->first; a; a=a_next)
{
mark_node(a->head);
a_next = a->next;
if (a->head == _i[x])
{
REMOVE_FROM(a->sister, _i[x]);
a->sister->sister = NULL;
a->sister = NULL;
a_selfloop = a;
}
else if (a->head == _i[1-x])
{
REMOVE_FROM(a->sister, _i[1-x]);
_i[x]->tr_cap -= a->r_cap;
_i[1-x]->tr_cap += a->r_cap;
a->sister->sister = NULL;
a->sister = NULL;
}
else
{
SET_FROM(a, _i[x]);
SET_TO(a->sister, _i[x]);
}
}
}
_j[0]->first = _j[1]->first = NULL;
if (a_selfloop)
{
a_selfloop->next = first_free;
first_free = a_selfloop;
}
}
template <typename REAL>
int QPBO<REAL>::MergeParallelEdges(Arc* a1, Arc* a2)
{
code_assert(a1->sister->head == a2->sister->head && IsNode0(a1->sister->head));
code_assert(a1->head == a2->head || a1->head == GetMate(a2->head));
REAL delta;
int x;
Node* _i[2];
Node* _j[2];
Arc* _a1[2] = { a1, GetMate(a1) };
Arc* _a2[2] = { a2, GetMate(a2) };
_i[0] = a1->sister->head; _i[1] = GetMate0(_i[0]);
if (a1->head == a2->head)
{
a1->r_cap += a2->r_cap;
a1->sister->r_cap += a2->sister->r_cap;
_a1[1]->r_cap += _a2[1]->r_cap;
_a1[1]->sister->r_cap += _a2[1]->sister->r_cap;
x = 1;
_j[0] = a1->head;
_j[1] = GetMate(_j[0]);
}
else
{
code_assert(a1->head == GetMate(a2->head));
// make sure that _a1[0]->r_cap == _a1[1]->r_cap and _a1[0]->sister->r_cap == _a1[1]->sister->r_cap by pushing flow
delta = _a1[1]->r_cap - _a1[0]->r_cap;
//_a1[1]->r_cap -= delta; // don't do the subtraction - later we'll set explicitly _a1[1]->r_cap = _a1[0]->r_cap
//_a1[1]->sister->r_cap += delta;
_a1[1]->sister->head->tr_cap -= delta;
_a1[1]->head->tr_cap += delta;
// same for a2
delta = _a2[1]->r_cap - _a2[0]->r_cap;
//_a2[1]->r_cap -= delta; // don't do the subtraction - later we'll set explicitly _a2[1]->r_cap = _a2[0]->r_cap
//_a2[1]->sister->r_cap += delta;
_a2[1]->sister->head->tr_cap -= delta;
_a2[1]->head->tr_cap += delta;
if (a1->r_cap + a1->sister->r_cap >= a2->r_cap + a2->sister->r_cap) x = 1;
else // swap a1 <-> a2
{
Arc* tmp;
tmp = a1; a1 = a2; a2 = tmp;
_a1[0] = a1;
_a2[0] = a2;
tmp = _a1[1]; _a1[1] = _a2[1]; _a2[1] = tmp;
x = 0;
}
_j[0] = a1->head;
_j[1] = a2->head;
REAL ci, cj, cij, cji;
ci = a2->sister->r_cap - a2->r_cap;
cj = 0;
cij = -a2->r_cap;
cji = -a2->sister->r_cap;
_i[0]->tr_cap += ci; _i[1]->tr_cap -= ci;
_j[0]->tr_cap += cj; _j[1]->tr_cap -= cj;
_a1[0]->r_cap += cij;
_a1[0]->sister->r_cap += cji;
if (_a1[0]->r_cap < 0)
{
delta = _a1[0]->r_cap;
_a1[0]->r_cap = 0;
_a1[0]->sister->r_cap += delta;
_i[0]->tr_cap -= delta; _i[1]->tr_cap += delta;
_j[0]->tr_cap += delta; _j[1]->tr_cap -= delta;
}
if (_a1[0]->sister->r_cap < 0)
{
delta = _a1[0]->sister->r_cap;
_a1[0]->sister->r_cap = 0;
_a1[0]->r_cap += delta;
_j[0]->tr_cap -= delta; _j[1]->tr_cap += delta;
_i[0]->tr_cap += delta; _i[1]->tr_cap -= delta;
}
code_assert (_a1[0]->r_cap >= 0);
_a1[1]->r_cap = _a1[0]->r_cap;
_a1[1]->sister->r_cap = _a1[0]->sister->r_cap;
}
REMOVE_FROM(a2, _i[0]);
REMOVE_FROM(a2->sister, a2->head);
REMOVE_FROM(_a2[1], _a2[1]->sister->head);
REMOVE_FROM(_a2[1]->sister, _i[1]);
a2->sister->sister = NULL;
a2->sister = NULL;
_a2[1]->sister->sister = NULL;
_a2[1]->sister = NULL;
_a2[1]->next = first_free;
first_free = _a2[1];
return x;
}
template <typename REAL>
inline REAL QPBO<REAL>::DetermineSaturation(Node* i)
{
Arc* a;
REAL c1 = -i->tr_cap;
REAL c2 = i->tr_cap;
for (a=i->first; a; a=a->next)
{
c1 += a->r_cap;
c2 += a->sister->r_cap;
}
return (c1 > c2) ? c1 : c2;
}
template <typename REAL>
inline void QPBO<REAL>::AddDirectedConstraint(Node* i, Node* j, int xi, int xj)
{
code_assert(first_free && IsNode0(i) && IsNode0(j) && i!=j);
int e = ((int)(first_free - arcs[IsArc0(first_free) ? 0 : 1])) & (~1);
first_free = first_free->next;
Arc* _a[2] = { &arcs[0][e], &arcs[1][e] };
Node* _i[2] = { i, GetMate0(i) };
Node* _j[2];
if (xi==xj) { _j[0] = j; _j[1] = GetMate0(j); }
else { _j[1] = j; _j[0] = GetMate0(j); }
SET_SISTERS(_a[0], _a[0]+1);
SET_SISTERS(_a[1], _a[1]+1);
SET_FROM(_a[0], _i[0]);
SET_TO(_a[0], _j[0]);
SET_FROM(_a[0]->sister, _j[0]);
SET_TO(_a[0]->sister, _i[0]);
SET_FROM(_a[1], _j[1]);
SET_TO(_a[1], _i[1]);
SET_FROM(_a[1]->sister, _i[1]);
SET_TO(_a[1]->sister, _j[1]);
if (xi==0) { _a[0]->r_cap = probe_options.C; _a[0]->sister->r_cap = 0; }
else { _a[0]->r_cap = 0; _a[0]->sister->r_cap = probe_options.C; }
_a[1]->r_cap = _a[0]->r_cap;
_a[1]->sister->r_cap = _a[0]->sister->r_cap;
}
/*
template <typename REAL>
inline bool QPBO<REAL>::AddDirectedConstraint(Arc* a, int xi, int xj)
{
Node* i = a->sister->head;
Node* j = a->head;
Node* _i[2] = { i, GetMate0(i) };
Node* _j[2];
Arc* _a[2] = { a, GetMate(a) };
int x; // 0 if current edge is submodular, 1 otherwise
REAL delta;
_j[0] = j;
if (IsNode0(j)) { _j[1] = GetMate0(j); x = 0; }
else { _j[1] = GetMate1(j); x = 1; }
if ((xi + xj + x)%2 == 0)
{
// easy case - graph structure doesn't need to be changed
if (xi == 0)
{
if (a->r_cap + _a[1]->r_cap >= 2*probe_options.C) return false;
mark_node(_j[0]);
mark_node(_j[1]);
a->r_cap += 2*probe_options.C;
_a[1]->r_cap += 2*probe_options.C;
return true;
}
else
{
if (a->sister->r_cap + _a[1]->sister->r_cap >= 2*probe_options.C) return false;
mark_node(_j[0]);
mark_node(_j[1]);
a->sister->r_cap += 2*probe_options.C;
_a[1]->sister->r_cap += 2*probe_options.C;
return true;
}
}
mark_node(_j[0]);
mark_node(_j[1]);
// make sure that _a[0]->r_cap == _a[1]->r_cap and _a[0]->sister->r_cap == _a[1]->sister->r_cap by pushing flow
delta = _a[1]->r_cap - _a[0]->r_cap;
//_a[1]->r_cap -= delta; // don't do the subtraction - later we'll set explicitly _a[1]->r_cap = _a[0]->r_cap
//_a[1]->sister->r_cap += delta;
_a[1]->sister->head->tr_cap -= delta;
_a[1]->head->tr_cap += delta;
SET_TO(_a[0], _j[1]);
SET_TO(_a[1]->sister, _j[0]);
REMOVE_FROM(_a[0]->sister, _j[0]);
SET_FROM(_a[0]->sister, _j[1]);
REMOVE_FROM(_a[1], _j[1]);
SET_FROM(_a[1], _j[0]);
i->tr_cap += a->sister->r_cap - a->r_cap; _i[1]->tr_cap -= a->sister->r_cap - a->r_cap;
a->r_cap = -a->r_cap;
if (xi == 0) a->r_cap += 2*probe_options.C;
else a->sister->r_cap += 2*probe_options.C;
if (a->r_cap < 0)
{
delta = a->r_cap;
a->r_cap = 0;
a->sister->r_cap += delta;
i->tr_cap -= delta; _i[1]->tr_cap += delta;
_j[1]->tr_cap += delta; j->tr_cap -= delta;
}
if (a->sister->r_cap < 0)
{
delta = a->sister->r_cap;
a->sister->r_cap = 0;
a->r_cap += delta;
_j[1]->tr_cap -= delta; j->tr_cap += delta;
i->tr_cap += delta; _i[1]->tr_cap -= delta;
}
_a[1]->r_cap = a->r_cap;
_a[1]->sister->r_cap = a->sister->r_cap;
return true;
}
*/
template <typename REAL>
inline bool QPBO<REAL>::AddDirectedConstraint0(Arc* a, int xi, int xj)
{
Node* i = a->sister->head;
Node* j = a->head;
Node* _i[2] = { i, GetMate0(i) };
Node* _j[2];
Arc* _a[2] = { a, GetMate(a) };
int x; // 0 if current edge is submodular, 1 otherwise
REAL delta;
_j[0] = j;
if (IsNode0(j)) { _j[1] = GetMate0(j); x = 0; }
else { _j[1] = GetMate1(j); x = 1; }
if ((xi + xj + x)%2 == 0)
{
// easy case - graph structure doesn't need to be changed
if (a->r_cap + a->sister->r_cap + _a[1]->r_cap + _a[1]->sister->r_cap >= 2*probe_options.C) return false;
mark_node(_j[0]);
mark_node(_j[1]);
if (xi == 0)
{
a->r_cap += probe_options.C;
_a[1]->r_cap += probe_options.C;
}
else
{
a->sister->r_cap += probe_options.C;
_a[1]->sister->r_cap += probe_options.C;
}
return true;
}
mark_node(_j[0]);
mark_node(_j[1]);
// make sure that _a[0]->r_cap == _a[1]->r_cap and _a[0]->sister->r_cap == _a[1]->sister->r_cap by pushing flow
delta = _a[1]->r_cap - _a[0]->r_cap;
//_a[1]->r_cap -= delta; // don't do the subtraction - later we'll set explicitly _a[1]->r_cap = _a[0]->r_cap
//_a[1]->sister->r_cap += delta;
_a[1]->sister->head->tr_cap -= delta;
_a[1]->head->tr_cap += delta;
SET_TO(_a[0], _j[1]);
SET_TO(_a[1]->sister, _j[0]);
REMOVE_FROM(_a[0]->sister, _j[0]);
SET_FROM(_a[0]->sister, _j[1]);
REMOVE_FROM(_a[1], _j[1]);
SET_FROM(_a[1], _j[0]);
i->tr_cap += a->sister->r_cap - a->r_cap; _i[1]->tr_cap -= a->sister->r_cap - a->r_cap;
a->r_cap = -a->r_cap;
if (xi == 0) a->r_cap += probe_options.C + a->sister->r_cap - a->r_cap;
else a->sister->r_cap += probe_options.C + a->sister->r_cap - a->r_cap;
if (a->r_cap < 0)
{
delta = a->r_cap;
a->r_cap = 0;
a->sister->r_cap += delta;
i->tr_cap -= delta; _i[1]->tr_cap += delta;
_j[1]->tr_cap += delta; j->tr_cap -= delta;
}
if (a->sister->r_cap < 0)
{
delta = a->sister->r_cap;
a->sister->r_cap = 0;
a->r_cap += delta;
_j[1]->tr_cap -= delta; j->tr_cap += delta;
i->tr_cap += delta; _i[1]->tr_cap -= delta;
}
_a[1]->r_cap = a->r_cap;
_a[1]->sister->r_cap = a->sister->r_cap;
return true;
}
template <typename REAL>
inline bool QPBO<REAL>::AddDirectedConstraint1(Arc* a, int xi, int xj)
{
Node* j = a->head;
Node* _j[2];
Arc* _a[2] = { a, GetMate(a) };
int x; // 0 if current edge is submodular, 1 otherwise
_j[0] = j;
if (IsNode0(j)) { _j[1] = GetMate0(j); x = 0; }
else { _j[1] = GetMate1(j); x = 1; }
code_assert((xi + xj + x)%2 == 0);
if (xi == 0)
{
if (a->r_cap > 0 && _a[1]->r_cap > 0) return false;
mark_node(_j[0]);
mark_node(_j[1]);
a->r_cap += probe_options.C;
_a[1]->r_cap += probe_options.C;
return true;
}
else
{
if (a->sister->r_cap > 0 && _a[1]->sister->r_cap > 0) return false;
mark_node(_j[0]);
mark_node(_j[1]);
a->sister->r_cap += probe_options.C;
_a[1]->sister->r_cap += probe_options.C;
return true;
}
}
template <typename REAL>
void QPBO<REAL>::AllocateNewEnergy(int* mapping)
{
int i_index, j_index;
int nodeNumOld = GetNodeNum();
int nodeNumNew = 1;
int edgeNumOld = GetMaxEdgeNum();
int e;
Node* i;
////////////////////////////////////////////////////////////////
for (i_index=0, i=nodes[0]; i_index<nodeNumOld; i_index++, i++)
{
if (mapping[i_index] < 0)
{
mapping[i_index] = 2*nodeNumNew + ((i->user_label) % 2);
nodeNumNew ++;
}
else if (mapping[i_index]>=2) mapping[i_index] = -mapping[i_index];
}
////////////////////////////////////////////////////////////////
code_assert(nodes[0] + nodeNumNew <= node_max[0]);
// Reset:
node_last[0] = nodes[0];
node_last[1] = nodes[1];
node_num = 0;
if (nodeptr_block)
{
delete nodeptr_block;
nodeptr_block = NULL;
}
if (changed_list)
{
delete changed_list;
changed_list = NULL;
}
if (fix_node_info_list)
{
delete fix_node_info_list;
fix_node_info_list = NULL;
}
maxflow_iteration = 0;
zero_energy = 0;
stage = 0;
all_edges_submodular = true;
////////////////////////////////////////////////////////////////
AddNode(nodeNumNew);
AddUnaryTerm(0, (REAL)0, (REAL)1);
i = nodes[0];
i->user_label = i->label = 0;
for (i_index=0; i_index<nodeNumOld; i_index++)
{
if (mapping[i_index] >= 2)
{
i = nodes[0] + (mapping[i_index]/2);
i->user_label = i->label = mapping[i_index] & 1;
mapping[i_index] &= ~1;
}
}
////////////////////////////////////////////////////////////////
for (i_index=0; i_index<nodeNumOld; i_index++)
if (mapping[i_index] < 0)
{
int y[2];
int x = 0;
j_index = i_index;
do
{
x = (x - mapping[j_index]) % 2;
j_index = (-mapping[j_index])/2 - 1;
} while (mapping[j_index] < 0);
y[x] = mapping[j_index];
y[1-x] = mapping[j_index] ^ 1;
x = 0;
j_index = i_index;
do
{
int m_old = mapping[j_index];
mapping[j_index] = y[x];
x = (x - m_old) % 2;
j_index = (-m_old)/2 - 1;
} while (mapping[j_index] < 0);
}
////////////////////////////////////////////////////////////////
int edgeNumNew = 0;
for (e=0; e<edgeNumOld; e++)
{
if ( arcs[0][2*e].sister )
{
Arc* a;
Arc* a_mate;
if (IsNode0(arcs[0][2*e].sister->head))
{
a = &arcs[0][2*e];
a_mate = &arcs[1][2*e];
}
else
{
a = &arcs[1][2*e+1];
a_mate = &arcs[0][2*e+1];
}
i_index = mapping[(int)(a->sister->head - nodes[0])] / 2;
code_assert(i_index > 0 && i_index < nodeNumNew);
first_free = &arcs[0][2*edgeNumNew++];
if (IsNode0(a->head))
{
j_index = mapping[(int)(a->head - nodes[0])] / 2;
code_assert(j_index > 0 && j_index < nodeNumNew);
AddPairwiseTerm(i_index, j_index,
0, a->r_cap+a_mate->r_cap, a->sister->r_cap+a_mate->sister->r_cap, 0);
}
else
{
j_index = mapping[(int)(a->head - nodes[1])] / 2;
code_assert(j_index > 0 && j_index < nodeNumNew);
AddPairwiseTerm(i_index, j_index,
a->r_cap+a_mate->r_cap, 0, 0, a->sister->r_cap+a_mate->sister->r_cap);
}
}
}
first_free = &arcs[0][2*edgeNumNew];
memset(first_free, 0, (int)((char*)arc_max[0] - (char*)first_free));
InitFreeList();
}
const int LIST_NUM = 4;
struct List // contains LIST_NUM lists containing integers 0,1,...,num-1. In the beginning, each integer is in list 1.
{
List(int _num, int* order)
: num(_num)
{
int i;
prev = new int[num+LIST_NUM]; prev += LIST_NUM;
next = new int[num+LIST_NUM]; next += LIST_NUM;
if (order)
{
for (i=0; i<num; i++)
{
prev[order[i]] = (i==0) ? -1 : order[i-1];
next[order[i]] = (i==num-1) ? -1 : order[i+1];
}
prev[-1] = order[num-1];
next[-1] = order[0];
}
else
{
for (i=0; i<num; i++)
{
prev[i] = i-1;
next[i] = i+1;
}
prev[-1] = num-1;
next[-1] = 0;
next[num-1] = -1;
}
for (i=2; i<=LIST_NUM; i++)
{
prev[-i] = -i;
next[-i] = -i;
}
}
~List()
{
delete [] (prev - LIST_NUM);
delete [] (next - LIST_NUM);
}
// i must be in the list
void Remove(int i)
{
next[prev[i]] = next[i];
prev[next[i]] = prev[i];
}
void Move(int i, int r_to) // moves node i to list r_to
{
code_assert (r_to>=1 && r_to<=LIST_NUM);
Remove(i);
next[i] = -r_to;
prev[i] = prev[-r_to];
next[prev[-r_to]] = i;
prev[-r_to] = i;
}
void MoveList(int r_from, int r_to) // append list r_from to list r_to. List r_from becomes empty.
{
code_assert (r_from>=1 && r_from<=LIST_NUM && r_to>=1 && r_to<=LIST_NUM && r_from!=r_to);
if (next[-r_from] < 0) return; // list r_from is empty
prev[next[-r_from]] = prev[-r_to];
next[prev[-r_to]] = next[-r_from];
prev[-r_to] = prev[-r_from];
next[prev[-r_from]] = -r_to;
prev[-r_from] = next[-r_from] = -r_from;
}
// i must be in the list
// (or -r, in which case the first element of list r is returned).
// Returns -1 if no more elements.
int GetNext(int i) { return next[i]; }
private:
int num;
int* next;
int* prev;
};
template <typename REAL>
void QPBO<REAL>::SetMaxEdgeNum(int num)
{
if (num > GetMaxEdgeNum()) reallocate_arcs(2*num);
}
template <typename REAL>
bool QPBO<REAL>::Probe(int* mapping)
{
int i_index, i_index_next, j_index;
Node* i;
Node* j;
Node* _i[2];
Arc* a;
Arc* a_next;
int x;
Node** ptr;
bool is_enough_memory = true;
int unlabeled_num;
if (probe_options.order_array) probe_options.order_seed = 0;
if (probe_options.order_seed != 0)
{
srand(probe_options.order_seed);
probe_options.order_array = new int[GetNodeNum()];
ComputeRandomPermutation(GetNodeNum(), probe_options.order_array);
}
List list(GetNodeNum(), probe_options.order_array);
if (probe_options.order_seed != 0)
{
delete [] probe_options.order_array;
}
if (node_last[0] == node_max[0]) reallocate_nodes((int)(node_last[0] - nodes[0]) + 1);
all_edges_submodular = false;
Solve();
int MASK_CURRENT = 1;
int MASK_NEXT = 2;
unlabeled_num = 0;
for (i=nodes[0], i_index=0; i<node_last[0]; i++, i_index++)
{
if (i->label >= 0)
{
FixNode(i, i->label);
mapping[i_index] = i->label;
i->is_removed = 1;
list.Remove(i_index);
}
else
{
i->is_removed = 0;
i->list_flag = MASK_CURRENT;
mapping[i_index] = -1;
unlabeled_num ++;
}
i->label_after_fix0 = -1;
i->label_after_fix1 = -1;
}
maxflow();
// INVARIANTS:
// node i_index is removed <=> mapping[i_index] >= 0 <=> nodes[0][i_index].is_removed == 1
// edge e is removed <=> Arc::sister does not point to the correct arc for at least one out of the 4 arcs
// Four lists are used: 1,2,3,4. In the beginning of each iteration
// lists 3 and 4 are empty. current_list is set to the lowest non-empty list (1 or 2).
// After the iteration current_list becomes empty, and its former nodes are moved
// either to list 3 (if the node or its neighbor has changed) or to list 4.
//
// Invariants during the iteration:
// - i->list_flag == MASK_CURRENT => i is in current_list
// - i->list_flag == MASK_CURRENT & MASK_NEXT => i is in current_list, after processing should be moved to list 3
// - i->list_flag == MASK_NEXT => i is in list 3
// - i->list_flag == 0 => i is not in current_list and not in list 3
//
// After the iteration, list 3 is eroded probe_dilation-1 times (it acquired nodes from lists 2 and 4).
// It is then moved to list 1 (which is now empty) and list 4 is added to list 2.
while ( 1 )
{
bool success = true;
// Try fixing nodes to 0 and 1
int current_list = (list.GetNext(-1) >= 0) ? 1 : 2;
for (i_index=list.GetNext(-current_list) ; i_index>=0; i_index=i_index_next)
{
i_index_next = list.GetNext(i_index);
i = nodes[0]+i_index;
code_assert (!i->is_removed && i->label<0);
_i[0] = i;
_i[1] = GetMate0(i);
bool is_changed = false;
REAL INFTY0 = DetermineSaturation(i);
REAL INFTY1 = DetermineSaturation(_i[1]);
REAL INFTY = ((INFTY0 > INFTY1) ? INFTY0 : INFTY1) + 1;
// fix to 0, run maxflow
mark_node(i);
mark_node(_i[1]);
AddUnaryTerm(i, 0, INFTY);
maxflow(true, true);
if (what_segment(i)!=0 || what_segment(_i[1])!=1)
{
printf("Error in Probe()! Perhaps, overflow due to large capacities?\n");
}
for (ptr=changed_list->ScanFirst(); ptr; ptr=changed_list->ScanNext())
{
j = *ptr;
code_assert(!j->is_removed && j->label<0);
j->label_after_fix0 = what_segment(j);
if (j->label_after_fix0 == what_segment(GetMate0(j))) j->label_after_fix0 = -1;
else if (i->user_label == 0) j->user_label = j->label_after_fix0;
}
// fix to 1, run maxflow
mark_node(i);
mark_node(_i[1]);
AddUnaryTerm(i, 0, -2*INFTY);
maxflow(true, true);
if (what_segment(i)!=1 || what_segment(_i[1])!=0)
{
printf("Error in Probe()! Perhaps, overflow due to large capacities?\n");
}
mark_node(i);
mark_node(_i[1]);
AddUnaryTerm(i, 0, INFTY);
// go through changed pixels
bool need_to_merge = false;
for (ptr=changed_list->ScanFirst(); ptr; ptr=changed_list->ScanNext())
{
j = *ptr;
code_assert(!j->is_removed && j->label<0);
j->label_after_fix1 = what_segment(j);
if (j->label_after_fix1 == what_segment(GetMate0(j))) j->label_after_fix1 = -1;
else if (i->user_label == 1) j->user_label = j->label_after_fix1;
if (i == j || j->label_after_fix0 < 0 || j->label_after_fix1 < 0) continue;
j_index = (int)(j - nodes[0]);
is_changed = true;
if (j->label_after_fix0 == j->label_after_fix1)
{
// fix j
FixNode(j, j->label_after_fix0);
mapping[j_index] = j->label_after_fix0;
}
else
{
// contract i and j
ContractNodes(i, j, j->label_after_fix0);
mapping[j_index] = 2*i_index + 2 + j->label_after_fix0;
need_to_merge = true;
}
j->is_removed = 1;
if (i_index_next == j_index) i_index_next = list.GetNext(j_index);
list.Remove(j_index);
unlabeled_num --;
}
if (need_to_merge)
{
// merge parallel edges incident to i
for (a=i->first; a; a=a->next) // mark neighbor nodes
{
j_index = (int)(a->head - nodes[IsNode0(a->head) ? 0 : 1]);
mapping[j_index] = (int)(a - arcs[0]);
}
for (a=i->first; a; a=a_next)
{
a_next = a->next;
j_index = (int)(a->head - nodes[IsNode0(a->head) ? 0 : 1]);
Arc* a2 = &arcs[0][mapping[j_index]];
if (a2 == a) continue;
mark_node(a->head);
mark_node(GetMate(a->head));
if (MergeParallelEdges(a2, a)==0)
{
mapping[j_index] = (int)(a - arcs[0]);
a_next = a->next;
}
}
for (a=i->first; a; a=a->next)
{
j_index = (int)(a->head - nodes[IsNode0(a->head) ? 0 : 1]);
mapping[j_index] = -1;
}
}
// add directed links for neighbors of i
for (a=i->first; a; a=a->next)
{
j = a->head;
int label[2];
if (IsNode0(j))
{
label[0] = j->label_after_fix0;
label[1] = j->label_after_fix1;
}
else
{
label[0] = GetMate1(j)->label_after_fix0;
label[1] = GetMate1(j)->label_after_fix1;
}
for (x=0; x<2; x++)
{
if (label[x]>=0 && label[1-x]<0)
{
if (AddDirectedConstraint0(a, x, label[x])) is_changed = true;
}
}
}
maxflow(true, true);
mark_node(i);
mark_node(_i[1]);
for (a=i->first; a; a=a->next)
{
j = a->head;
int label[2];
if (IsNode0(j))
{
label[0] = j->label_after_fix0; j->label_after_fix0 = -1;
label[1] = j->label_after_fix1; j->label_after_fix1 = -1;
}
else
{
label[0] = GetMate1(j)->label_after_fix0; GetMate1(j)->label_after_fix0 = -1;
label[1] = GetMate1(j)->label_after_fix1; GetMate1(j)->label_after_fix1 = -1;
}
for (x=0; x<2; x++)
{
if (label[x]>=0 && label[1-x]<0)
{
if (AddDirectedConstraint1(a, x, label[x])) is_changed = true;
}
}
}
// add directed constraints for nodes which are not neighbors
if (probe_options.directed_constraints!=0)
{
for (ptr=changed_list->ScanFirst(); ptr; ptr=changed_list->ScanNext())
{
j = *ptr;
int x, y;
if (j->is_removed) continue;
if (i == j) continue;
if (j->label_after_fix0 >= 0 && j->label_after_fix1 < 0) { x = 0; y = j->label_after_fix0; }
else if (j->label_after_fix1 >= 0 && j->label_after_fix0 < 0) { x = 1; y = j->label_after_fix1; }
else continue;
if (first_free)
{
AddDirectedConstraint(i, j, x, y);
is_changed = true;
}
else
{
is_enough_memory = false;
break;
}
}
}
if (probe_options.dilation >= 0)
{
// if is_changed, add i and its neighbors to list 3, otherwise add i to list 2 (unless it's already there)